[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5232) Use intern() to reuse strings and reduce memory usage / save 6%

[Gail Badner (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=37174#action_37174 ] 

Gail Badner commented on HHH-5232:
----------------------------------

A patch for 3.6 is at HHH-3924.

> Use intern() to reuse strings and reduce memory usage / save 6% 
> ----------------------------------------------------------------
>
>                 Key: HHH-5232
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5232
>             Project: Hibernate Core
>          Issue Type: Patch
>          Components: core
>    Affects Versions: 3.6
>         Environment: Hibernate 3.6.0-SNAPSHOT
> Linux x86_64 Bits
>            Reporter: Yves Galante
>            Assignee: Gail Badner
>            Priority: Minor
>         Attachments: DuplicateString.patch
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> This patch is an update of JIRRA HHH-3924 for Hibernate 3.6.
> Testsuite executed without new failures.
> Resume of the original JIRRA HHH-3924 :
> >>DefaultEntityAliases suffix and rowIdAliases String fields are not interned as are other fields in the class. This leads to significant >>of memory usage on our application.
> >>BasicLoader suffixes and QueryLoader sqlAliasSuffixes can also be interned so as to save more memory
> See the detailed result of this patch :
> ========================================
> Test conditions 
> ========================================
> Hibernate version : 3.6.0-SNAPSHOT
> Yourkit           : 8.0
> OS                : Linux x86_64 Bits.
> Test case         : org.hibernate.test.legacy.ParentChildTest.testReplicate()
> Time              : Memory snapshot is taken at the of the test.
> ========================================
> Result before patch 
> ========================================
> SessionFactoryImpl size : 3939 KB
> Duplicates String example :
> "0_"       : 452 duplicates (32KB)
> "rowid_0_" : 405 duplicates (32KB)
> "1_"       : 145 duplicates (10KB)
> "rowid_1_" : 130 duplicates (10KB)
> ...
> "fee3_"    :  65 duplicates (5KB)
> "glarch1_" :  55 duplicates (5KB)
> ...
> "foo2_2_5" :  46 duplicates (3KB)
> ...
> "string"   :  28 duplicates (2KB)
> ========================================
> Result after patch 
> ========================================
> SessionFactoryImpl size  : 3688 KB 
> Save 251 Kb, 6% of the session factory size.

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